Metal hydroxides （MAH） consisting of magnesium hydroxide and aluminum hydroxide with a mass ratio of 1：2 were surface-modified by y-diethoxyphosphorous ester propyldiethoxymethylsilane, boric acid and diphenylsilan...Metal hydroxides （MAH） consisting of magnesium hydroxide and aluminum hydroxide with a mass ratio of 1：2 were surface-modified by y-diethoxyphosphorous ester propyldiethoxymethylsilane, boric acid and diphenylsilanediol in xylene under dibutyl tin dilaurate catalyst at 140 ℃. Phosphorus, silicon and boron elements covalently bonded to metal hydroxide particles were detected by X-ray photoelectron spectroscopy. The degradation behavior of the surface-modified MAH was characterized by thermogravimetric analysis. The results show that linear low density polyethylene （LLDPE） composite, filled with 50% （mass fraction） of MAH modified by 5.0% （mass fraction） of modifiers, passes the V-0 rating of UL-94 test and shows the limited oxygen index of 34%, and its heat release rate and average effective heat combustion in a cone calorimeter measurement decrease obviously; The mechanical properties of MAH can be improved by surface-modification. The uniform dispersion of particles and strong interfacial bonding between particles and matrix are obtained.展开更多
为探讨国内外室内重金属和有机磷阻燃剂污染特征研究领域的发展历程、研究热点、前沿领域,检索了2003-2022年间Web of Science核心合集数据库中有关室内重金属和有机磷阻燃剂污染特征研究的404篇文献,利用CiteSpace和VOSviewer两个可视...为探讨国内外室内重金属和有机磷阻燃剂污染特征研究领域的发展历程、研究热点、前沿领域,检索了2003-2022年间Web of Science核心合集数据库中有关室内重金属和有机磷阻燃剂污染特征研究的404篇文献,利用CiteSpace和VOSviewer两个可视化软件分析国家、研究机构和关键词,并绘制图谱。结果表明:室内重金属和有机磷阻燃剂污染特征的相关研究在2003-2022年间总体呈上升趋势。室内重金属污染研究领域主要包括职业暴露、住宅区室内重金属污染与室外环境的关系、城市家庭灰尘、微量元素的生物可给性以及颗粒物来源5个大方向;室内有机磷阻燃剂污染研究领域主要包括有机磷阻燃剂的生物可给性、毒性研究、室内空气污染、人体灰尘暴露的风险评估4个大方向。该领域的研究热点随着时间和需求而改变,研究方向朝着人体健康深入,室内灰尘是贯穿该领域的重点研究对象,后期研究重点均聚焦人体健康风险评估。展开更多
基金Project(20574020) supported by the National Natural Science Foundation of ChinaProject(20061001) supported by the Opening Project of the Key Laboratory of Polymer Processing Engineering, Ministry of Education, ChinaProject (20060106-2) supported by Guangdong Key Projects
文摘Metal hydroxides （MAH） consisting of magnesium hydroxide and aluminum hydroxide with a mass ratio of 1：2 were surface-modified by y-diethoxyphosphorous ester propyldiethoxymethylsilane, boric acid and diphenylsilanediol in xylene under dibutyl tin dilaurate catalyst at 140 ℃. Phosphorus, silicon and boron elements covalently bonded to metal hydroxide particles were detected by X-ray photoelectron spectroscopy. The degradation behavior of the surface-modified MAH was characterized by thermogravimetric analysis. The results show that linear low density polyethylene （LLDPE） composite, filled with 50% （mass fraction） of MAH modified by 5.0% （mass fraction） of modifiers, passes the V-0 rating of UL-94 test and shows the limited oxygen index of 34%, and its heat release rate and average effective heat combustion in a cone calorimeter measurement decrease obviously; The mechanical properties of MAH can be improved by surface-modification. The uniform dispersion of particles and strong interfacial bonding between particles and matrix are obtained.
文摘为探讨国内外室内重金属和有机磷阻燃剂污染特征研究领域的发展历程、研究热点、前沿领域,检索了2003-2022年间Web of Science核心合集数据库中有关室内重金属和有机磷阻燃剂污染特征研究的404篇文献,利用CiteSpace和VOSviewer两个可视化软件分析国家、研究机构和关键词,并绘制图谱。结果表明:室内重金属和有机磷阻燃剂污染特征的相关研究在2003-2022年间总体呈上升趋势。室内重金属污染研究领域主要包括职业暴露、住宅区室内重金属污染与室外环境的关系、城市家庭灰尘、微量元素的生物可给性以及颗粒物来源5个大方向;室内有机磷阻燃剂污染研究领域主要包括有机磷阻燃剂的生物可给性、毒性研究、室内空气污染、人体灰尘暴露的风险评估4个大方向。该领域的研究热点随着时间和需求而改变,研究方向朝着人体健康深入,室内灰尘是贯穿该领域的重点研究对象,后期研究重点均聚焦人体健康风险评估。
